The New Encyclopaedia Britannica in 30 Volumes  vol. 6, micropaedia, ready reference and Index 
Encyclopedia Britannica 
 - 21st ed. 
 - Chicago  Encyclopaedia Britannica  1984 
 - 1026p. 
<br/><br/><label>ISBN: </label>0-85229-413-1 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Encyclopedia-Micropaedia<br/>NASA Thesaurus
<br/><br/><label>Universal Decimal Class. No.: </label>031  / EBR-6